For someone who has to ask that? Play some bot games until you've used every character, then decide for yourself.

Warwick is generally **** unless you jungle well, and in higher ELO you won't get away with that against a good team. Try Jax, Sion, and Cho'Gath for some (relatively) easy melee chunky/stabby chars.

hes prolly asking that so he knows which champ to buy with his IP, and obviously doesnt have every champ.

edit: back on topic, i dont really have an idea what hero is similar to warwick but if u like jungling u could try master yi, amumu and fiddlesticks, although most of them have really different playstyles.

Relax, I come from Dota. If your going to respond like that don't bother, thanks!

Despite this being the internet, I didn't actually mean to be offensive, I meant only that you should try them out for yourselves, because there are several ways to play each character. If you went into a little more detail, like what play style you prefer, or which DotA characters you played, it might be easier to suggest things.

there is no "better" character in essence. Ive seen tons of players QQ about Ashe and yet i wreck her on a daily basis with my Ryze... its all how your playstyle goes along with the hero. Back in Dota, my fav hero was Enchantress because i liked jungling and random ganks early, then wrecking late. That is pretty much Warwick in playstyle terms but I dont like how he works. Try out heroes, research diff ones before unlocking, and keep practicing until you find one that "clicks" with how you play.
EDIT: Lol... gotta stop using wc3 terminology like "heroes"....